Before the Civil War In United States, it was illegal to punish a slave without a good reason.
Prior to the Civil war, the enslaves people were used as wage labor for plantation, construction etc
The practice of slavery was more active in the South than in the North of United States
However, during the Civil war, both the North and South used the slaves (African Americans) for military purposes.
Despite the practice of slavery, it was illegal to punish a slave without a good reason although punishing them was allowed if they failed to work, get un-motivated etc
Therefore, the Option A is correct.
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